PURPOSE:To reduce restrictiveness and invasiveness against the measurement of blood pressure, by a method wherein the blood pressures at intervals of a fixed time are measured with a time-zone, in which the blood pressure is at the lowest value, as the starting point, and on the basis of these measured values, a regression curve composed of curves each having different periods is made. CONSTITUTION:The diurnal fluctuation of blood pressure, which is information necessary for the diagnosis of hypertension and the determination of curative effect, is obtained by measuring blood pressure values and pulse rates per day, e.g. six points at intervals of four hours + or - a quater, with a time-zone, e.g. at 3a.m. + or -15min., in which the blood pressure is at the lowest value, as the starting point. That is, on the basis of the periodical regression analysis of the blood pressure values and the pulse rates at the six points obtained, the fit of two cosine curves, during 24 hours and 12 hours, is done and a blood pressure fluctuation level, i.e., a median, and a pattern, which is prescribed by a phase and an oscillation, are found. In this way, it is made unnecessary for a patient to always attach a blood pressure determination device to the body except that the patient is sleeping, and since only one or two points are measured even if the patient is usually sleeping, restrictiveness and invasiveness can be reduced.
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